Fix mouse cursor update timer to be page-global instead of per-frame

Source/core/page/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 108 matching lines @@
     void updateDragStateAfterEditDragIfNeeded(Element* rootEditableElement);
 
     void scheduleHoverStateUpdate();
     void scheduleCursorUpdate();
 
     void setResizingFrameSet(HTMLFrameSetElement*);
 
     void resizeScrollableAreaDestroyed();
 
     IntPoint lastKnownMousePosition() const;
-    Cursor currentMouseCursor() const { return m_currentMouseCursor; }
 
     // Attempts to scroll the DOM tree. If that fails, scrolls the view.
     // If the view can't be scrolled either, recursively bubble to the parent frame.
     bool bubblingScroll(ScrollDirection, ScrollGranularity, Node* startingNode = nullptr);
 
     bool handleMouseMoveEvent(const PlatformMouseEvent&);
     void handleMouseLeaveEvent(const PlatformMouseEvent&);
 
     bool handleMousePressEvent(const PlatformMouseEvent&);
     bool handleMouseReleaseEvent(const PlatformMouseEvent&);
@@ skipping 198 matching lines @@
 
     bool m_mouseDownMayStartSelect;
     bool m_mouseDownMayStartDrag;
     bool m_mouseDownWasSingleClickInSelection;
     enum SelectionInitiationState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };
     SelectionInitiationState m_selectionInitiationState;
 
     LayoutPoint m_dragStartPos;
 
     Timer<EventHandler> m_hoverTimer;
+
+    // TODO(rbyers): Mouse cursor update is page-wide, not per-frame.  Page-wide state
+    // should move out of EventHandler to a new PageEventHandler class. crbug.com/449649
     Timer<EventHandler> m_cursorUpdateTimer;
 
     bool m_mouseDownMayStartAutoscroll;
 
     Timer<EventHandler> m_fakeMouseMoveEventTimer;
 
     bool m_svgPan;
 
     DeprecatedPaintLayerScrollableArea* m_resizeScrollableArea;
 
     RefPtrWillBeMember<Node> m_capturingMouseEventsNode;
     bool m_eventHandlerWillResetCapturingMouseEventsNode;
 
     RefPtrWillBeMember<Node> m_nodeUnderMouse;
     RefPtrWillBeMember<Node> m_lastNodeUnderMouse;
     RefPtrWillBeMember<LocalFrame> m_lastMouseMoveEventSubframe;
     RefPtrWillBeMember<Scrollbar> m_lastScrollbarUnderMouse;
-    Cursor m_currentMouseCursor;
 
     int m_clickCount;
     RefPtrWillBeMember<Node> m_clickNode;
 
     RefPtrWillBeMember<Node> m_dragTarget;
     bool m_shouldOnlyFireDragOverEvent;
 
     RefPtrWillBeMember<HTMLFrameSetElement> m_frameSetBeingResized;
 
     LayoutSize m_offsetFromResizeCorner; // In the coords of m_resizeScrollableArea.
 
     bool m_mousePositionIsUnknown;
+    // The last mouse movement position this frame has seen in root frame coordinates.
     IntPoint m_lastKnownMousePosition;
     IntPoint m_lastKnownMouseGlobalPosition;
     IntPoint m_mouseDownPos; // In our view's coords.
     double m_mouseDownTimestamp;
     PlatformMouseEvent m_mouseDown;
     RefPtr<UserGestureToken> m_lastMouseDownUserGestureToken;
 
     RefPtrWillBeMember<Node> m_latchedWheelEventNode;
     bool m_widgetIsLatched;
 
@@ skipping 32 matching lines @@
     // scroll sequence in this frame, or any child frames. Only used
     // with ScrollCustomization. If some delta has been consumed, a
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 #endif // EventHandler_h